Improvement in concrete pavements



UNITED STATES PATENT OFFICE.

LEWIS S. FILBERT, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN CONCRETE PAVEMENTS.

Specification forming part of Letters Patent No. 188,6!4, dated March 20, 1877; application filed February 26, 1877.

. January 9, 1872.

The improved pavement is laid on a base or substratum of broken stone well rolled and sprinkled or saturated with a composition distilled from coal-tar, or Trinidad or other asphalt, reduced by petroleum-tar or dead-oil distilled from tar.

' Upon this base is laid a hinder or layer of small broken stone or gravel, well heated and mixed with a composition distilled from coaltar, or Trinidad or other asphalt, or both, reduced by a residuum of petroleum or petroleum-tar, and then well rolled with a steam or other heavy roller.

Upop this is laid either one or two layers of Trinidad or other asphalt, reduced by the residuum of petroleum or petrolcum-tar,in the proportion of one part of residuum of petroleum to from three to eight parts of asphalt, as the case may be, well heated and mixed with fine sand or stone-dust, hydraulic or other cement, and a sulficient quantity of sulphur to vulcanize the mixture.

This mass is placed and spread upon the I do not -conlinemyself to any particular v proportions of the ingredients, as they may be varied according to the qualityot the pavement desired, and the use to which the pavement is to be put.-

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

A vulcanized pavement formed with a base of broken stone rolled and sprinkled or saturated with a composition distilled from coaltar, or asphalt reduced by petroleumtar; then a binder or layer of small broken stone or gravel heated and mixed with a composition distilled from coal-tar or asphalt, or both, reduced by residuum of petroleum or petroleum-tar, and well rolled; and then a layer or top coat of Trinidad, or other asphalt, reduced by petroleum-tar mixed with fine sand, stonedust, hydraulic cement, and sulphur, and heated so as to vulcanize the same, and then top-dressed with hydraulic or other cement, substantially as herein set forth.

Intestimony that I claim the foregoing, I have hereunto set my hand this 20th day of February, 1877,

L. s. FILBERT. Witnesses J. M. MASON, FRANK GALT. 

